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Title of Journal: J Mech Sci Technol

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Abbravation: Journal of Mechanical Science and Technology

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Korean Society of Mechanical Engineers

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DOI

10.1016/0038-1101(68)90122-6

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1976-3824

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Effect of leading edge boundary layer thickness on

Authors: Jibing Lan Yonghui Xie Di Zhang
Publish Date: 2012/08/25
Volume: 25, Issue: 1, Pages: 3243-3251
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Abstract

This paper concerns the effect of leading edge boundary layer thickness on dimple flow structure and separation control A flat plate with adverse pressure gradient sufficient for separation was designed Large eddy simulation LES with dynamic Smagorinsky subgrid model was validated Dimples with R=0378 0994 1453 R is the ratio of leading edge boundary layer thickness to dimple depth were investigated The results show that the horseshoe vortex dominates the dimple flow structure As R increases the head of the horseshoe vortex rises further away from the wall and moves downstream Hairpin vortices in the dimple wake are productions of the horseshoe vortex Both the horseshoe vortex and the hairpin vortices energize the boundary layer by mixing with the freestream fluid As R increases the separation control effectiveness decreasesJibing Lan received his BS degree in mechanical engineering from Xi’an Jiaotong University in 2006 and he is now a PhD candidate of Institute of Turbomachinery Xi’an Jiaotong University China His research efforts focused on augmentation of heat transfer in internal passages of gas turbine blade and high load blade design of gas/steam turbine He is now a student member of ASME and a student member of CSAAYonghui Xie is currently Professor of Institute of Turbomachinery at Xi’an Jiaotong University China From 1998 to 2001 he worked as post doctoral fellow in Kyushu Institute of Technology Japan He has been working on turbomachinery strength vibration and aerodynamics of turbomachinery since he received his PhD in 1997

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